That tells us something, that there were people among the Egyptians who were making the connections, connecting the dots correctly between the visits of Moses and Aaron and the plagues. In other words, the Egyptians were receiving the equivalent of news broadcasts, with the help of God, giving them understanding that there was a connection going on there. These things were not being done in a corner and God was not hiding His participation in what was going on. And the connection to the Israelites being there in Egypt and the treatment they were receiving from the Egyptian people, and especially the governing body, was beginning to be made by the Egyptians themselves. God does not do things in the corner. He does not hide Himself from what is going on. He makes sure that people know that there is a connection between what is going on in the public and what is happening being occasioned by the people.
That tells you very clearly that the message did not just get to Pharaoh, it also got to the people. God gave Egypt fair warning of what was going to occur, and whether you were an Egyptian or whether you were an Israelite, if you wanted to heed that warning, you saved your skin. Do you think that if an Egyptian heard the warning about the blood on the doorpost and the lintel and so forth and decided to put it on his own house, do you think that person would have died even though he was firstborn? Absolutely not! He would have been covered by the blood of the lamb because he believed. God's promises go out to everybody.